By identifying correlation between physiological changes that develop in work and professional errors of ship operators the complex of informative parameters to be used in assaying ther performance has been determined. The complex includes: latent period of a complex sensorimotor response with a choice, critical frequence of fusion of light oscillations, heart rate, tolerance to static force, pulse arterial pressure and index of a two-minute step-test. With the aid of the complex of clinical, physiological and psychophysiological methods it has been shown that indirect indices of performance of operators in long voyages deteriorate two or three weeks earlier than its direct signs. It has been found that the operator's performance can in principle be quantified. It can be done by taking into consideration changes in the informative indices during a specific operation and contribution of each of them to the integrative evaluation of the operator's performance.

Adaptation, Physiological↗

PubMedDate not supplied

[Tolerance for controlled physical loading in chronic hypercapnia in man].

Young healthy test subjects showed adaptation to chronic hypercapnia during long-term exposure to an atmosphere containing 0.8--1.8% CO2 at normal atmospheric pressure: bradycardia, increase in vital lung capacity and chest movements, improvement of tests with breathing retention and further decrease in oxyhemoglobin. Simultaneously they exhibited an increase in the alkaline reserve of the blood and of the 2 min step-test index. This can be interpreted both as cause and effect: products of glycolysis are bound by buffer bases, thus reducing oxygen uptake per time unit. Study of adaptation to exercises of increasing workload demonstrated an earlier involvement of anaerobic mechanisms than under normal conditions: linear relationship between the workload and heart rate persisted only up to 150 beats/min. By the end of the second and the beginning of the third month of isolation the test subjects displayed deteriorated health state and work capacity in parallel with compensated acidosis.

Adaptation, Physiological↗